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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: RE: Follow-up on new build ST-70 with the 6NS7 tube posted by Sondek on April 2, 2023 at 07:48:12:
...but filament traces on the VTA board would have to be cut, and then rewired.
I considered doing that when Tre' suggested trying a 6CG7 in place of a 12AU7. But given the price of a NOS 6CG7, coupled with the trace cutting, I was hesitant, since I'd tried so many other things on my VTA board (various caps, resistors, and other tweaks) to get it to my liking, none of which ever worked. Sometimes there were improvements, but never enough to allow me to enjoy music with the amp.
After learning that a 6CG7 was essentially a noval 6SN7, and since I already had a few NOS 6SN7s, the adapter and 6SN7 was a less invasive (i.e. no trace cutting) way to try yet another experiment. Except that this time it worked. In retrospect, I could have bought a few 6CG7s from Jim McShane, and eliminated the adapter, but at the time I had become very skeptical that I'd ever find anything which would allow me to enjoy the amp.
If I knew then what I know now, I wouldn't hesitate to use a 6CG7, especially if I had some stashed away.
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Follow Ups
- A 6CG7 could be used... - 1973shovel 09:09:23 04/03/23 (4)
- Would that be easier than just replacing the driver board with the VTA Octal one? - JoshT 09:14:27 04/03/23 (3)
- It would certainly be "easier" from a physical labor standpoint - 1973shovel 09:53:40 04/03/23 (2)
- Thanks - JoshT 13:43:13 04/03/23 (1)
- I'm glad it's working out for you (nt) - 1973shovel 07:09:09 04/04/23 (0)
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